Dust-collecting system for dry-cleaning tables



Dec. 18, 1928. 1,695,570

R. w. ARMS DUST COLLECTING SYSTEM FDR DRY CLEANING TABLES "Filed Jan. 1926 3 Sheets-sheet 1- M [fay Wa /772) Illa/72616 Dec. 1a, 1928. r

R. W. ARMS DUST CULLECTING. SYSTEM FOR DRY CLEANING TABLES Filed Jan. 1926 3 sheets sheet 2 [fay Muff/72,5

v 1,695,570 R. w. ARMS DUST COLLECTING SYSTEM FOR DRY CLEANING TABLES Filed Jan. 1926 3 Sheets- Sheet :s

Patented Dec. 18,1928 y UNITED ST ATE'S PATENT OFFICE.

BAY W. ARMS, OF CHICAGO, ILLINOIS, ASSIGNOR T ROBERTS & SCHAEFER COM- PANY, or CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

DUST-COLLECTING SYSTEM FOR DRY-CLEANING- TABLES.

Application filed January, 9, was... Serial m. 80,138.

My invention relates to dust collecting systems and apparatus for dry cleaning or air separating talQlQS-and the like, and has for one objectto permit the withdrawal from the '5 coal or other material being, cleaned of a minimum percentage of the dust. Other objects are to provide a dust collecting system and apparatus wherein only enough .dust laden air is Withdrawn to prevent the discharge ofdust into the atmosphere of the room containing the dry cleaning apparatus.

In connection with some dust collecting apparatuses which have been suggested for this general purpose, an eflort, has been made to withdraw all the dust from with the material being treated, in some instances this means that as much as twenty percent by weight of the material fed to the dry cleaning tables is drawn oil with the dust laden air. This is undesirable both because of the large Volume of dust laden air that must be handled. and cleaned and because of the serious loss in wei ht of the coal that otherwise might be pro tably used. n In my apparatus and by my method where I draw ofi just enough excess air from above the air cleaning table to prevent the discharge of air into the room from the table, and where no effort is made to force off any dust beyond that in the air, as a direct result of the air cleaning, only about two percent b weight of the material comes ofiz' as dust. I

Myi invention is illustrated more or less diagrammatically in the accompanying drawings, whereina Figure 1 is a plan view with parts omitted and parts broken away of adry cleaning table to which my invention has been applied;

Figure 2 is a side elevation with parts broken away of the apparatus illustrated in Figv ure 1; and

Fi ure 3 is an end view. LiEe parts are'indicated by like characters throughout the specification and drawings.

- A is; a supportingframe upon which is mounted the table A by means of the links A reciprocated by an eccentric or crank which applies its power to the table through the connecting rod A, A is an air pervious deck-carried by the table and adapted to support and guide the flowing sheet of material as it travels across the separating zone and, as it is subjected to the separating action of the air column. A is a chimney through which the air or gas which assists in the dry through the chutes A cleaning process is .fed and guided to the underside of the pervious deck, and A is a chute through which the coal or other material to be treated is fed to the deck. A is a discharge trough arranged about the discharge sides of the table and adapted to catch the various parts of the separated sheet of material as it flows off the deck after treatment and to dis tribute the various products as desired a B is an air hood which overlies the table and deck, and is connected or joined to the periphery of the table by the aprons B which. make a substantially air tight joint between the deck and the table without inany way interfering with the reciprocating of the table. Thus the only openings between the hood and the table are those through which the coal enters the treating zone and through which it leaves the table after treatment. The hood has as showna'large widely extended area immediately above the table where the velocity of the airas it rises from the table is if anything reduced so as to provide a settling zone wherein any dust particles which may have been thrown up from the material being treated will be given an opportunity to settle out from the air current and be returned to the sheet of material. Above this settling zone the hood tapers as at B toward the discharge passage B which leads to any suitable form of airseparator and air exhausting apparatus. The volume of air drawn out through this passage is but slightly in excess of the volume of air fed through the deck and is justsuflicient to prevent the es cape of dust laden air into the room in which the apparatus is located. 1

, It will be evident that while Ihave shown in my drawings and described in my specification an operative form of my device still many changes in shape, operation and arrangement of parts may be made without departing materially from the spirit of my in-.

vention and I wish therefore that my drawings be regarded as in a sense diagrammatic. I I The use and operation of my invention are as follows: I l i The hood which overhangs the table is connected to it everywhere except at the not. It can be connected by means-of a flexible diaphragm or the like or mounted directly on these elements but the connection 1n any event is substantially air tight so that the only connection between the air above the table under the hood and the outside air, is through the coal supply chute and the. dis charge chute. r

An air vent leads from the upper portion of the hood to any suitable dust separating apparatus and means are provided to draw a current of air upwardly through the hood through such vent. The volume of airso withdrawn will be'substantially the same as the volume of air fed to the hood upwardly through the deck or table but the relative amounts will be so proportioned as to prevent the discharge of air from the hood or from between the hood and the table at any oints adjacent to the table'so that there will he an ingoing air current travelling with the coal as it reaches the screen and an ingoing air stream travelling against the coal as it is discharged from the table. Thus all dust laden air will be compelled to pass out through the vent or upper passage of the hood.

The hood is an expanding one and serves as an air settling chamber above the deck so that a large proportion of the dust which may be raised above the sheet of material being treated by the floating airwill have an opportunity to drop back into the bed and onl a relatively small part of the dust will fin its way out through the conduit from the top of the hood. Experience shows that whereas if the dust laden air isforced and an elfort is made to compel all of the dust to leave the coal as high as twenty percent by weight will be withdrawn and must then be otherwise handled and whereas by the use of the expanding settling chamber hood together with a very gentle air current most of the dust returns to the coal and only something like two percent is carried off to beseparately treated.

It will be noted especially that the discharge pipe B is located over the feed end of the table which is, experience has shown, the dustiest part of the table and it will also be noted especially that the bellows from the hood down to the table comes over the chutes through which discharge of the coal and refin a directionopposite to the outflow of material from the table and thus taking off from such material those light dust particles which might otherwise as the coal is further handled be blown oil the building and make conditions unsatisfactory. Any dust that goes on a ainst this air current is dust just sufficiently a hering to the material to insure that it has good chances of getting clear out of the system and being shipped with the coal as it should be.

I claim 1. In a dry cleaning apparatus, a pervious reciprocating deck, means'for feeding a flowing sheet of granular material thereacross, means for passing a moving column of air 11pwardly thru the sheet, a hood located above the deck containing an air settling chamber bounded on its underside by the sheet of material and means for withdrawing air fromsaid hood at a point above the settling chamber and widely separated from the sheet of material, and a closure between the hood and the deck at all points about its periphery except the space thru which the sheet of ma-' 'terial enters and is discharged from the deck,

the hood being fixed in position independent of the movement of the deck.

2. In a dry cleaning apparatus, a pervious deck, means for feeding a flowing sheet of granular material thereacross, means for passing a moving column of air upwardly through the sheet, a hood located above the deck, means for withdrawing air from said hood, a flexible connection between the hood and the deck to limit the entrance of air between them, chutes through which material is.

discharged from the deck, the flexible .conn'ecto insure a draft of air upwardly through said chutes in a direction opposite tothe flow 'tions overlying the chutes and so arranged as of the material as it is discharged from the a deck.

Signed at Chicago, county of Cook and State of Illinois, this 14th day of December,

' RAY W. ARMS. 

